Fauna Marin Reference Liquid

[Batts]

Hi guys, I was wondering if any of you has tried the fauna Marin multi reference liquid and had good results?

How I ended up with this is, earlier this week I tested my freshly mixed redsea salt saltwater and alk & mag were spot on as advertised on the bucket but had a low reading on the calcium ie 375.
This put me in doubt that my salifert test kit could be inaccurate as I was almost at the end of the bottle.
My LFS suggested I get this reference liquid to test my test kit. I tested with the same salifert test kit n I got reading of 390 where it should have been 422 as per what the reference bottle say...

Today I bought redsea calcium pro test kit (I needed a new one anyway) to test the reference liquid, I got a reading of 380..

Now confused which one to believe? Can the reference liquid be off in calcium only?

Tested the mag & alk of the reference liquid and they seem to be close enough.

[chromus]

Sounds like your technique with the kit isn't quite right or the kit is out of date.